package com.bennu.controller;

import com.bennu.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 * 图片的上传下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value( "${reggie.path}" )
    private String basePath;
    //文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info( file.toString() );
        //使用原始文件名
        String originalFilename = file.getOriginalFilename();
        //截取后缀名jpg
        String suffix = originalFilename.substring( originalFilename.lastIndexOf( "." ) );
        //生成随机文件名
        String fileName = UUID.randomUUID().toString()+suffix;
        //判断是否存在reggieImg文件
        File dir=new File( basePath );
        //判断当前目录是否存在,不从在创建
        if ( !dir.exists() ){
            dir.mkdirs();
        }
        //将临时文件转存到指定目录
        try {
            file.transferTo( new File( basePath+fileName ) );
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success( fileName );
    }
    //文件下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //输入流读文件内容
            FileInputStream fileInputStream=new FileInputStream(new File( basePath+name )  );
            //输出流写文件内容
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType( "image/jpeg" );
            int len=0;
            byte[] bytes=new byte[1024];
            //不等于-1表示还没有读完
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write( bytes,0,len );
                outputStream.flush();
            }
            //关流
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}
